, education. especially to our youth, we have to educate them about what a concussion is. we don't have to be unconscious. less than 10% of concussions result in unconsciousness. so what the symptoms are. and then, two, when they have a concussion, know that it's okay not to play. if you don't feel complete, don't compete. if you don't feel right in the head, rest instead. i think that's the message that our youth needs to hear. that it's okay, that toughness is like a badge of honor, so it's understandable that they want to continue to play. but when it comes to the brain trauma, it's a completely different issue. >> right, you can replace a kneecap and move on, but you cannot do that with a brain. i want to add into the conversation. paul callan, our legal analyst, and david epstein. how significant are these findings when it comes to the nfl? there are 2,000 players who now have lawsuits against the nfl? is this something that could be do or die for the league? >> i think everybody sort of expected to see cte in junior seau. i think we sort of know that story, when somebody's played